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Proceedings Paper

Capacitive micromachined ultrasonic transducers (CMUTs) for photoacoustic imaging
Author(s): Srikant Vaithilingam; Ira O. Wygant; Paulina S. Kuo; Xuefeng Zhuang; Ömer Oralkan; Peter D. Olcott; Butrus T. Khuri-Yakub
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Paper Abstract

In photoacoustic (optoacoustic) medical imaging, short laser pulses irradiate absorbing structures found in tissue, such as blood vessels, causing brief thermal expansions that in turn generate ultrasound waves. These ultrasound waves which correspond to the optical absorption distribution were imaged using a two dimensional array of capacitive micromachined ultrasonic transducers (CMUTs). Advantages of CMUT technology for photoacoustic imaging include the ease of integration with electronics, ability to fabricate large two dimensional arrays, arrays with arbitrary geometries, wide-bandwidth arrays and high-frequency arrays. In this study, a phantom consisting of three 0.86-mm inner diameter polyethylene tubes inside a tissue mimicking material was imaged using a 16 x 16 element CMUT array. The center tube was filled with India-ink to provide optical contrast. Traditional pulse-echo data as well as photoacoustic image data were taken. 2D cross-sectional slices and 3D volume rendered images are shown. Simple array tiling was attempted, whereby a 48 x 48 element array was simulated, to illustrate the advantages of larger arrays. Finally, the sensitivity of the photoacoustics setup to the concentration of ink in the tube was also explored. For the sensitivity experiment a different phantom consisting of only one 1.14-mm inner diameter polyethylene tube inside a tissue mimicking material was used. The concentration of the ink inside the tube was varied and images were taken.

Paper Details

Date Published: 6 March 2006
PDF: 11 pages
Proc. SPIE 6086, Photons Plus Ultrasound: Imaging and Sensing 2006: The Seventh Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics, 608603 (6 March 2006); doi: 10.1117/12.659459
Show Author Affiliations
Srikant Vaithilingam, Stanford Univ. (United States)
Ira O. Wygant, Stanford Univ. (United States)
Paulina S. Kuo, Stanford Univ. (United States)
Xuefeng Zhuang, Stanford Univ. (United States)
Ömer Oralkan, Stanford Univ. (United States)
Peter D. Olcott, Stanford Univ. (United States)
Butrus T. Khuri-Yakub, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 6086:
Photons Plus Ultrasound: Imaging and Sensing 2006: The Seventh Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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